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MCQs

Total Questions : 91 | Page 2 of 10 pages
Question 11. Which of the following chemical is sometime added in the process of coagulation and flocculation?
  1.    Aluminum sulphate
  2.    Aluminum oxide
  3.    Calcium chloride
  4.    None of these
 Discuss Question
Answer: Option A. -> Aluminum sulphate
Answer: (a).Aluminum sulphate
Question 12. Application of quaternary ammonium compounds as sanitizing agents tends to
  1.    favor gram positive bacteria
  2.    decrease gram positive bacteria
  3.    increase the percentage of gram(-)ve rods on utensils
  4.    none of the above
 Discuss Question
Answer: Option C. -> increase the percentage of gram(-)ve rods on utensils
Answer: (c).increase the percentage of gram(-)ve rods on utensils
Question 13. Acid used mostly for removal of milk stone is
  1.    phosphoric acid
  2.    nitric acid
  3.    gluconic acid
  4.    tartaric acid
 Discuss Question
Answer: Option B. -> nitric acid
Answer: (b).nitric acid
Question 14. According to BIS the maximum permissible limit of dissolved solids in drinking water is
  1.    1000 mg/l
  2.    500 mg/l
  3.    2000 mg/l
  4.    1500 mg/l
 Discuss Question
Answer: Option C. -> 2000 mg/l
Answer: (c).2000 mg/l
Question 15. Permanent hardness of water is caused by the presence of
  1.    bicarbonates of calcium and magnesium
  2.    carbonates of sodium and potassium
  3.    chlorides and sulfates of calcium and magnesium
  4.    phosphates of sodium and potassium
 Discuss Question
Answer: Option C. -> chlorides and sulfates of calcium and magnesium
Answer: (c).chlorides and sulfates of calcium and magnesium
Question 16. From the following sanitizers which one comes under category of surface active agents?
  1.    Tetra phosphate
  2.    Teepol
  3.    Meta phosphate
  4.    None of these
 Discuss Question
Answer: Option B. -> Teepol
Answer: (b).Teepol
Question 17. Calgon is used for removal of
  1.    sodium carbonate
  2.    permanent hardness of water
  3.    potassium carbonate
  4.    none of these
 Discuss Question
Answer: Option B. -> permanent hardness of water
Answer: (b).permanent hardness of water
Question 18. The activated sludge process consists of returning a portion of the clarifier
  1.    effluent water entering the reactor
  2.    influent water coming out of the reactor
  3.    influent water entering the reactor
  4.    effluent water coming out of the reactor
 Discuss Question
Answer: Option C. -> influent water entering the reactor
Answer: (c).influent water entering the reactor
Question 19. The purest form of naturally occurring water is
  1.    rain water
  2.    river water
  3.    pond water
  4.    well water
 Discuss Question
Answer: Option A. -> rain water
Answer: (a).rain water
Question 20. The water being used in dairy industry should contain not more than
  1.    5 proteolytic and/or lipolytic organisms per ml
  2.    10 proteolytic and/or lipolytic organisms per ml
  3.    15 proteolytic and/or lipolytic organisms per ml
  4.    20 proteolytic and/or lipolytic organisms/ml
 Discuss Question
Answer: Option A. -> 5 proteolytic and/or lipolytic organisms per ml
Answer: (a).5 proteolytic and/or lipolytic organisms per ml

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